Add in a few more constant symbol supports
Reverting change to hello_jrubyfx as it does not compile
Load all files in core_ext instead of searching for classes
Common utils converter_for supports both constructors and setters (slightly hack)
Update samples a hair
Use platform.exit instead of system.exit
Properly caching jfxrt.jar missing error and spewing more helpful information
Adding a Notes document about the DSL syntax